[填空题]
In putting, the force with wa p5 cqne +-.gaqp/ff/hich a golfer strikes a ball imf8/o l7knx. as planned so that the ball will stop within some small distance of the cup, say, 1mfxkl.a78o / n.0 m long or short, in case the putt is missed. Accomplishing this from an uphill lie (that is, putting downhill, see Fig. 2–39) is more difficult than from a downhill lie. To see why, assume that on a particular green the ball decelerates constantly at $20 m/s^2$ going downhill, and constantly at $3.0 m/s^2$ going uphill. Suppose we have an uphill lie 7.0 m from the cup. Calculate the allowable range of initial velocities we may impart to the ball so that it stops in the range 1.0 m short to 1.0 m long of the cup. m/s to m/sDo the same for a downhill lie 7.0 m from the cup. m/s to m/sWhat in your results suggests that the downhill putt is more difficult?
